试题与答案

某一般性质的220kV变电站,电压等级为220/110/10kV,两台相同的主变压器

题型:单项选择题 案例分析题

题目:

某一般性质的220kV变电站,电压等级为220/110/10kV,两台相同的主变压器,容量为240/240/120MVA,短路阻抗Uk(1-2)%=14,Uk(3-1)%=25,Uk(2-3)%=8,两台主变压器同时运行的负载为65%,220kV架空线路进线2回,110kV架空负荷出线8回,10kV电缆负荷出线12回,设两段,每段母线出线6回,每回电缆平均长度为6km,电容电流为2A/km,220kV母线穿越功率为200MVA,220kV母线短路容量为16000MVA,主变压器10kV出口设计XKK-10-2000-10限流电抗器一台。请回答下列问题。

从系统供电经济合理性考虑,该变电站一台主变10kV侧最少应带下列哪项负荷值时,该变压器选型是合理的()?

A.120MVA

B.72MVA

C.36MVA

D.18MVA

答案:

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参考答案:墙

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